Jar



Dec. 16, 1924' 1,519,551

G. B. PRIMMER JAR Filed April lO, 1922 .I li

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Patented Dec. 16, 1924.

UNITED STATES 1,519,551 PATENT OFFICE.

GEORGE B. PEIMMER, OF ARTEsIA, OALrEoRNIA, AssIGNon OE ONE-HALE 'ro GEORGE SPROULE, OE MON'rmaELLo, CALIFORNIA.

JAR.

'Application led April 10, 1922. Serial No. 551,412.

To all whom t may concern.'

Be it known that I, GEORGE B. PRIMMER, a subject of the King of Great Britain, residing at Artesia, in the county of Los Angeles and State of California, have invented new and useful Improvements in Jars, of which the following is a specification. Y

This invention relates to jars, and p articularly to rotary jars, and so far as I a m aware, at the present time, there is not 1n the well drilling art such a thing as a jar suitable for rotary rigs. Jars apparently are quite common in wire line outfits or standard outfits, but a rotary jar has never been used. True, a standard jar may be used-with the rotary, but the use of such.

a jar is not productive of good results. The reason is possibly quite obvious, as in the rotary system it is a prime essential that thick clay mud be constantly forced through the grief stem, if a grief stem is used, so that the mud flows upwardly in the well hole to the surface in order to keep the walls of the well hole from caving. As a consequence, if a standard jar is used it is im possible to cause circulation of the mud through said jar, with'the result that many feet of either fishing line or tubinlg does not have any flow of mud therethroug Assuming a. specific instance where a standard jar in combination with a rota is used, suppose we attach an over-shot in order to pick up a string of tubing; -the rotary is in operation, mud is forced through the opening in the grief stem. down-as far as the jar to where it flows back to the surface of the well hole, the over-shot descends and engages the tubing to be fished from the well. After the overshot has sufiicientl engaged and encompassed the tubing, t e vrotation, of he grief stem is stopped, and the grief stem is movcgd or attempted to be moved, longitudinally upward from the well hole in order to lift the tubing. What happens? More than likely a freezing may occur. Not having any circulation of mud at the bottom of the well the tubing refuses to budge, the well hole is dry beneath the jar, and the tubing, as well as the grief stem quite possibly is stuck. In fact, this has been the experience of the inventor and some twelve or fifteen hours are usually consumed in attempting to break loose. It is therefore essential for fishing operations or otherwise, to utilize some system whereby a circulation of the mud may be made to the bottom of the well or-where operations are being conducted. There must be no impediment in the circulation in order toobtain good results and overcome freezing. It is just as easy to fish for lost tubing a thousand feet within a well hole, as it is within twenty feet, with the device about to be described. My invention therefore has for an ob'ect the provision of a jar which is forme to allow a circulation therethrough, and whichwill effectively loosen tubing, and will be a positive preventive of any freezing The invention has for further objects the provision of an improved jar which will be superior in point of relative simplicity and inexpensiveness, taken,v in conjunction with utility, durability, general efficiency and serviceability.

With the above mentioned and other objects in view, the invention consists in the novel and useful provision, formation, construction, combination, association and interrelation of parts, members and features, as illustrated 1n some of its embodiments in the accompanying drawing, described in the following statement and finally pointed out in claims. v

In the drawing:

Figure 1 is a' fragmentary vertical view of a well hole with tubing therein and thev imploved rotary jar in combination therewit .Figure 2 is an enlarged fragmentary view of a jar, certain parts being 1n section and showing the interior of said jar;

Figure 3 is a view of the jartaken on the line 3-3 of Figure 2, and looking in the direction of the appended arrows; and

Figure 4 is a fragmentary view, certain parts being in section, and showing the 'ar bar member at the inward limit of its stro e.

Corresponding parts in all the figures are designated by the same reference characters.

With particular reference to the drawing.l A designates the improved rotary jar and said jar in the embodiment shown includes a jar bar a and a bowl member or cylinder b which is annular in formation and provided with a large and small bore 1 and 2 respectively. One end, as 3, of the member b is provided with tapered threads '4. 'Ille bore 2 is an rlidar in formation, that in the drawing s owing the bore to be v nare, as at 5, with the corners as 6 turned o The wall portions surrounding the two bores are inter-connected by a beveled wall 7. The end as 8 of the member b is formed with an annular curved groove 9 and the end is also formed with a recess 10 adapted to confine packing 11, and a cap 12, the inner wall of the cap and packing being in alignment with the wall surrounding the bore 2. The jar bar a is of a formation corresponding to the bore 2; that is to say, it is square4sided with the corners turned olf, and the said jar bar is provided with a central bore 13. The jar bar passes through the bore 2 and an end of said jar bar is provided with a flanged head 14, the said head being provided with a bevel portion 15, which bevel portion is adapted to contact with the bevel portion 7 of the member b, thus forming, when the jar bar a and the cylinder b are in the position shown in Figure2, a ground joint. The jar bar a is of course inserted through the end or mouth 3 of the member b, and the end, as

16 of the bar a is provided with a taper,

thread 17. This taper thread is in screwthreaded engagement with an annular membei' 1 8, said annular member being provided with an enlarged taper-threaded portion 19 for connection with a grief stem or with some form of tubing 20, the tubing 20 presenting a circular outer surface in the showing. An end as 21 of the member 18 is annularly recessed as at 22, the said recess forming a narrow extension ring 23 which may or may not be integral with the member 18. The end of the jar bar where it communicates with the member 18 has its bore 13 flared outwardly as shown at 24. The end 8 of the member b carries 11p-standing bolts 25, and the cap 12 is (pro- 4vided with a plurality of out-stan ing spaced lugs 26 adapted to receive the bolts between said lugs with nuts 27 screwthreaded upon said bolts for engagement with the lugs for maintaining the cap in position. The cap of course must correspond in form to the periphery of the jar bar a, and the same is true concerning the packing. When the tubing 20 is drop ed the jar bar will drop through the mem er b until the convexedly curved end 28 of the ring 23 contacts with the annular groove 9, the end 28 and the annular groove 9 cooperating to form a ground joint. This position is illustrated in Figure 4 and the ring 23 surrounds the cap 12 without touching the same.A 'The bore within the member b is of coursepof sufficient length to allow a full stroke` of the jar bar a.. A nipple 29 may be screw-threaded to the threads 4 of the member b, the said nipple being annular and carrying a substitute tool as 30. This.. substitute tool 30 may be provided with an over-shot, as illustrated in .Fi ure 1 at 31. It will thusbe seen that 'a may not be so tight as to not permit mud from escaping between surfaces thereof. Mud flowing through the member 20 will of course flow through the circulation hole 13 in the member a down through the member b, hence through the nipple 29 and through the member 30 to the bottom of the well hole. At no time' is the circulation of the mud stopped, and as a result freezing is overcome. Where circulation is not continued to the endot the well hole, the ressure of the mud will impede a lifting o the tubing by causing a downward pressure upon the parts. In Figure 1 the tubing 32 is being fished from the well hole 33, an oversho 31 being used for this purpose, and it is to be noted that the tubing 32 is received within the over-shot. The rotary of course is turning the tubing and jar, as well as the tubing connected therewith and gradually turns its way over the tubing 32. The vmud of course iscirculating all the time and when the over-shot has sufficiently I tary movement may be stopped and the tubin'lpulled upwardly.

1e rotary jar s own inthe'drawing is so constructed that loss of the mud flowing through said jar may be prevented at extreme limits of movementof the jar bar relative to the bowl b. 'The ground joints 'aid in the prevention of loss of mud. The

engaged the tubing 32 the rogland or packing 11 is preferably formed in two parts so that if the packing should happen to break or deteriorate for any reason whatsoever, it would be unnecessary to take the members'comprising the jars apart in order to4 replace the gland. It will be understood that the bevel portion 15 of the head 14 coacting with the bevel wall 7 of the cylinder b will serve to jar the string of tubing upon u stroke of the jar bar. Upon downstrokeo Vthe latter the annular member 18 at its flange or extension ring 23 will cooperate with the top of the cylinder b, at the groove 9, to produce a jar action. Thus means are provided for jarring the string of tubing in both downward and upward directions for such purposes as may be desirable, for instance either to acty upon the rotary bit or to free or loosen the casing if frozen It is obvious that various changes and modifications may be made in practicing the invention, in departure from the particular description and showing of the accompanying drawing, ,all of said-changes and modifications, however, being made within a fair lll) interpretation of the invent-ion as defined by the scope of the appended claims.

Having thus disclosed my invention, I claim and desire to secure by Letters Patent: g

1. The combination with a string of tubing, of a jar member associated therewith; said jar member including a cylinder and a jar bar adapted to reciprocate therein, said 'ar bar being formed with a circulation ore; said cylinder having formed at one end thereof an annular groove, there being a member associated with the jar bar adapted to contact and be received 1n said groove at the lower 'limit of the jar bar stroke to form a ground joint with the cylinder.

2. Jar means for rotary tubing, ing a cylindrical member and a jar bar adapted to reciprocate therein; said jar bar and cylinder having co-acting portions for producing jar action upon downstroke of the jar bar, and further co-acting portions for producing jarring action upon the up stroke of the jar bar, the co-acting portions in one instance being disposed exteriorly of the jar bar and of the cylinder.

3. Jar means for rotary tubing, ing a cylindrical member-and a jar bar adapted to reciprocate therein; said jar bar and cylinder having co-acting portions for producing jar action upon down vstroke of the jar bar, and further co-acting portions for producing jarring action upon the up stroke of the jar bar, the co-acting portions in one instance being disposed exteriorly of the jar bar and of the cylinder; aid jar bar boing formed with a circular ore.

4. J ar means for rotary tubing, including a cylinder and a jar bar adapted to reciprocate therein; means being provided for producing jar action upon down stroke of the jar bar, said latter means being disposed exteriorly of the jar bar and of the cylinder.

5. Jar means for rotary tubing, including a cylinder and a jar bar adapted to reciprocate therein; means being provided for producing jar action upon down stroke of the jar' bar, said latter means being disposed ex teriorly of the jar barv and of the cylinder; ls)aid jar bar being formed with a circular ore.

6. Jar means for rotary tubing, including compriscomprisa cylinder and a jar bar adapted to reciprocate therein; means being provided for producing jar action upon down stroke of the jar bar, said latter means being dis osed exteriorly of the jar bar and o Athe cylinder; said latter means including an annular member upon the jar bar.

7. Jar means for rotary tubin including a cylinder and a jar bar a apted to reciprocate therein; means being provided for producing jar action upon 'down stroke of the jar bar, said latter means being disposed exteriorly of the jar bar and of the cylinder; said latter means including an annular member upon the jar bar; the cylinder being provided at the top with a grooved portion to receive said annular member.

8. Jar means for rotary tubino', including a cylinder and a jar bar adapte to reciprocate therein; means being provided for producing jar action upon down stroke of the jar bar, said latter means being dis osed exteriorly of the jar bar and oli) the cylinder; said latter means includin an annular member u on the jar bar; sai jar bar being provided). with a circular bore.

9. Jar means for rotary tubing, ing a cylindrical member and a jar bar adapted to reciprocate therein; said jar bar and cylinder having co-acting portions for producing jarV action upon down stroke of the jar bar, and further co-acting portions for producing jarring action upon the up stroke of the jar bar, the co-acting portions in one instance being dis osed exteriorly of the jar bar and of the cylinder; the jar bar and cylinder being in rotative couple.

10. Jar means for rotary tubin including a cylinder and a jar bar a apted to reciprocate therein; means being provided for producing jar action upon down stroke of the jar bar, said latter means being disposed exteriorly of the jar bar and of the cylinder; the and cylinder being in compris- Jar bar rotative couple.

In testimony whereof, I 'have signed my name to this specification in the presence of two subscribing Witnesses. 

